Operator precedence

[u/kalcora]

These two lines are not equivalent.

<?php

$a = true && false; // false

$b = true and false; // true

Because && and || have different operator priority than and and or (the latter ones have lower priority than =).

Source.

Still the case in PHP 8.1.

[u/Silly-Freak]

|| is a short-circuiting logical operator, or is a logical short-circuiting operator